The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 1986
Filed:
Jun. 20, 1984
Applicant:
Inventors:
Francis J Smit, Arvada, CO (US);
Dale K Huggins, Golden, CO (US);
Mark Berggren, Golden, CO (US);
Kurt R Anast, Arvada, CO (US);
Assignee:
AMAX Inc., Greenwich, CT (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C10L / ;
U.S. Cl.
CPC ...
44 51 ; 44 / ; 44 1 / ;
Abstract
Powdered coal is upgraded in utility and heat value by removal of ash and pyrite constituents by successively pressure caustic leaching the coal slurry at a temperature of at least about 175.degree. C., hydrochloric acid leaching the caustic leached coal to dissolve ash and pyrite residues not dissolved by the caustic, and pressure leaching the acid leached coal to remove alkali metals and chloride. Vanadium is also removed by the process.